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Topic starter
Hi, new to FM sound, enjoying what I've learnt so far and it's making sense, bought a DX to play around with and make it easier to create sounds and music.
I'm writing music targeting the YM2612 chip. This chip has a sine LFO feature which can generate frequencies of 3.98, 5.56, 6.02, 6.37, 6.88, 9.63, 48.1 and 72.2Hz.
I see on the DX there are settings for speed, PMD and AMD. What I don't understand is how to get the DX LFO set up so it generates only those frequencies I need for the target sound chip, as I want to get settings as close as possible. There doesn't seem to be a setting on the DX where I can put in the desired frequency and be done with it.
Can anyone shed any light on this? Is there a listing of which speed is which Hz anywhere? Cheers.
Posted : 21/01/2018 1:48 pm
I think I can help. For my "DXconvert" and "Reface DX Legacy Project" I did a lot of measurements on the Reface DX LFO frequencies. I can post a table with the LFO speed parameter values 0-127 and the corresponding frequencies in Hz according to my measurements. I have the data on my home computer not within reach right now. I will be back here later to post the table.
Posted : 24/01/2018 2:50 pm
LFS 0 = 0.026 Hz
LFS 1 = 0.042 Hz
LFS 2 = 0.084 Hz
LFS 3 = 0.126 Hz
LFS 4 = 0.168 Hz
LFS 5 = 0.210 Hz
LFS 6 = 0.252 Hz
LFS 7 = 0.294 Hz
LFS 8 = 0.336 Hz
LFS 9 = 0.372 Hz
LFS 10 = 0.412 Hz
LFS 11 = 0.456 Hz
LFS 12 = 0.505 Hz
LFS 13 = 0.542 Hz
LFS 14 = 0.583 Hz
LFS 15 = 0.626 Hz
LFS 16 = 0.673 Hz
LFS 17 = 0.711 Hz
LFS 18 = 0.752 Hz
LFS 19 = 0.795 Hz
LFS 20 = 0.841 Hz
LFS 21 = 0.880 Hz
LFS 22 = 0.921 Hz
LFS 23 = 0.964 Hz
LFS 24 = 1.009 Hz
LFS 25 = 1.049 Hz
LFS 26 = 1.090 Hz
LFS 27 = 1.133 Hz
LFS 28 = 1.178 Hz
LFS 29 = 1.218 Hz
LFS 30 = 1.259 Hz
LFS 31 = 1.301 Hz
LFS 32 = 1.345 Hz
LFS 33 = 1.386 Hz
LFS 34 = 1.427 Hz
LFS 35 = 1.470 Hz
LFS 36 = 1.514 Hz
LFS 37 = 1.554 Hz
LFS 38 = 1.596 Hz
LFS 39 = 1.638 Hz
LFS 40 = 1.681 Hz
LFS 41 = 1.722 Hz
LFS 42 = 1.764 Hz
LFS 43 = 1.807 Hz
LFS 44 = 1.851 Hz
LFS 45 = 1.891 Hz
LFS 46 = 1.932 Hz
LFS 47 = 1.975 Hz
LFS 48 = 2.018 Hz
LFS 49 = 2.059 Hz
LFS 50 = 2.101 Hz
LFS 51 = 2.143 Hz
LFS 52 = 2.187 Hz
LFS 53 = 2.227 Hz
LFS 54 = 2.269 Hz
LFS 55 = 2.311 Hz
LFS 56 = 2.354 Hz
LFS 57 = 2.395 Hz
LFS 58 = 2.437 Hz
LFS 59 = 2.480 Hz
LFS 60 = 2.523 Hz
LFS 61 = 2.564 Hz
LFS 62 = 2.606 Hz
LFS 63 = 2.648 Hz
LFS 64 = 2.691 Hz
LFS 65 = 2.772 Hz
LFS 66 = 2.854 Hz
LFS 67 = 2.940 Hz
LFS 68 = 3.028 Hz
LFS 69 = 3.108 Hz
LFS 70 = 3.191 Hz
LFS 71 = 3.275 Hz
LFS 72 = 3.362 Hz
LFS 73 = 3.444 Hz
LFS 74 = 3.528 Hz
LFS 75 = 3.613 Hz
LFS 76 = 3.701 Hz
LFS 77 = 3.858 Hz
LFS 78 = 4.023 Hz
LFS 79 = 4.194 Hz
LFS 80 = 4.372 Hz
LFS 81 = 4.532 Hz
LFS 82 = 4.698 Hz
LFS 83 = 4.870 Hz
LFS 84 = 5.048 Hz
LFS 85 = 5.206 Hz
LFS 86 = 5.369 Hz
LFS 87 = 5.537 Hz
LFS 88 = 5.711 Hz
LFS 89 = 6.024 Hz
LFS 90 = 6.353 Hz
LFS 91 = 6.701 Hz
LFS 92 = 7.067 Hz
LFS 93 = 7.381 Hz
LFS 94 = 7.709 Hz
LFS 95 = 8.051 Hz
LFS 96 = 8.409 Hz
LFS 97 = 8.727 Hz
LFS 98 = 9.057 Hz
LFS 99 = 9.400 Hz
LFS 100 = 9.756 Hz
LFS 101 = 10.291 Hz
LFS 102 = 10.855 Hz
LFS 103 = 11.450 Hz
LFS 104 = 12.077 Hz
LFS 105 = 12.710 Hz
LFS 106 = 13.376 Hz
LFS 107 = 14.077 Hz
LFS 108 = 14.815 Hz
LFS 109 = 15.440 Hz
LFS 110 = 16.249 Hz
LFS 111 = 17.100 Hz
LFS 112 = 17.476 Hz
LFS 113 = 18.538 Hz
LFS 114 = 19.663 Hz
LFS 115 = 20.857 Hz
LFS 116 = 22.124 Hz
LFS 117 = 23.338 Hz
LFS 118 = 24.620 Hz
LFS 119 = 25.971 Hz
LFS 120 = 27.397 Hz
LFS 121 = 28.902 Hz
LFS 122 = 30.303 Hz
LFS 123 = 31.646 Hz
LFS 124 = 33.003 Hz
LFS 125 = 34.364 Hz
LFS 126 = 37.037 Hz
LFS 127 = 39.682 Hz
Posted : 24/01/2018 7:19 pm
Topic starter
Thanks for this information, it's really useful. I guess I'll have to use the ones that do have approximate frequencies on the Reface for design purposes and then tweak things once transferred to the real chip using its native frequencies to see how it sounds.
Posted : 25/01/2018 7:45 pm
